The crystallogen sequence (a(n) = A018227(n)-4).

Terms

a(0) =6a(1) =14a(2) =32a(3) =50a(4) =82a(5) =114a(6) =164a(7) =214a(8) =286a(9) =358a(10) =456a(11) =554a(12) =682a(13) =810a(14) =972a(15) =1134a(16) =1334a(17) =1534a(18) =1776a(19) =2018a(20) =2306a(21) =2594a(22) =2932a(23) =3270a(24) =3662a(25) =4054a(26) =4504a(27) =4954a(28) =5466a(29) =5978